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从通常的晶体单色器△E≈1-2eV的能带宽度提高到10~(-8)～10~(-9)eV的核共振宽度,中间往在需要有一级预置单色器,将带宽△E进一步压缩到meV量级,它通常选用Si(10,6,4)或Si(8,4,0)的切割型双晶单色器(Channel Cut)来完成.建议用斜切晶面的切割型双晶单色器来完成,其Bragg角的调整用自制的长杠杆调节机构来实现.通常市售的Huber转角台昂贵且精度不够,切割型双晶单色器,两个平面间夹角的细调,用压紧弹簧螺杆来调节,应用接近室温的循环恒温水保持晶体温度的恒定,偏差在±0.1℃.讨论中也有反对使用预单色器的意见,认为预单色器虽然能改进信噪比,但会严重影响光源强度.是否选用单色器,应与选用的核单色器的类型统一考
From the energy band width of the conventional crystal monochromator △ E≈1-2eV to the nuclear resonance width of 10 -8 -8 -10 -9 eV, a first-order monochromator is needed in the middle, The bandwidth ΔE is further compressed to the meV level, which is usually done using a cut-type dual-crystal Monochromator with Si (10,6,4) or Si (8,4,0). It is recommended to use a chamfer Crystal faceted monocrystalline monochromator with a Bragg angle adjusted with a self-made long lever adjustment mechanism Typically commercially available Huber angle stages are expensive and not precise enough, the cutting twin crystal monochromators, two The fine angle between the planes is adjusted with a compression spring screw and the temperature of the crystal is kept constant at a temperature close to room temperature with a deviation of ± 0.1 ° C. There is also opposition to the use of pre-monochromators in the discussion, Although the color can improve the signal to noise ratio, but it will seriously affect the intensity of the light source. Whether the use of monochromators should be used with the type of nuclear monochromator uniform test